Graphics Reference
In-Depth Information
V PSNR vs Bitrate
Sequence: FourPeople Coding Conditions: RA-Main
48.5
47.5
46.5
45.5
44.5
43.5
42.5
JM18.5
HM12.1
41.5
0
500
1000
1500
2000
2500
3000
bitrate (kbps)
Fig. 9.8
R-D curve of V (Four People, RA-Main)
Tabl e 9. 9
Comparison of
coding performance of HEVC
and AVC (Random Access
Main)
Random Access Main
Y (%)
U (%)
V (%)
Book
58.8
55.2
56.7
BT709Birthday
60.4
54.3
57.6
HomelessSleeping
75.9
79.6
83.5
Menage
33.3
34.1
36.2
Trafftc
41.4
43.7
43.6
results demonstrate that HEVC intra coding outperforms encoders for still images
with an average bit rate reduction ranging from 16 % (compared to JPEG 2000
4:4:4) up to 43 % (compared to JPEG).
9.4
Subjective Performance Analysis
Because, subjective evaluation of video content correlates directly with the viewer
perceptual experience, it could very well be considered as a more reliable perfor-
mance measure of a codec. It is therefore important that for conducting subjective
evaluation test, the testing methodology be defined in accordance with the univer-
sally accepted guidelines and practices, such as those described in Recommendation
ITU-R BT.500 [
11
-
14
]. In the following sub-sections, we will further elaborate
on the testing methodology and environment together with references to subjective
evaluation test results.
